:root {
  --paper: #ffffff;
  --paper-2: #fbf8fa;
  --paper-3: #f7f0f4;
  --ink: #10172a;
  --ink-mid: #495467;
  --ink-mute: #626b7c;
  --ink-soft: #60697a;
  --accent: #8a2f62;
  --accent-2: #a33a73;
  --accent-soft: #faedf4;
  --blue: #2457d6;
  --blue-soft: #eef3ff;
  --green: #177149;
  --green-soft: #edf7f1;
  --red: #a33434;
  --red-soft: #f9eeee;
  --violet: #5b4794;
  --violet-soft: #f1eef7;
  --rule: #dde3df;
  --rule-strong: #aebbb4;
  --font-body: "Public Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-display: "Iowan Old Style", "Baskerville", "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --max: 1450px;
  --reading: 820px;
  --header-h: 72px;
  --shadow: 0 16px 38px rgba(16, 23, 42, 0.07);
}


* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}

body.menu-open {
  overflow: hidden;
}

::selection {
  color: var(--ink);
  background: #f0cfe1;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

a:hover {
  color: var(--accent);
}

button,
input,
select,
textarea {
  color: inherit;
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid rgba(138, 47, 98, 0.28);
  outline-offset: 3px;
}

img,
svg {
  max-width: 100%;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.skip-link {
  position: fixed;
  z-index: 999;
  top: 8px;
  left: 8px;
  padding: 9px 14px;
  color: #fff;
  background: var(--ink);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  height: var(--header-h);
  border-bottom: 1px solid var(--rule);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
}

.header-inner {
  display: flex;
  width: min(var(--max), calc(100% - 64px));
  height: 100%;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  width: 19px;
  height: 19px;
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  content: "";
}

.brand-mark::before {
  inset: 2px;
  border: 1px solid var(--ink);
  transform: rotate(45deg);
}

.brand-mark::after {
  top: 7px;
  left: 7px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.brand-name {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.brand-note {
  padding-left: 13px;
  border-left: 1px solid var(--rule-strong);
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

/* This course keeps the header intentionally quiet, matching the evidence-workbench concept. */
.brand-note {
  display: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 22px;
}

.site-nav a {
  position: relative;
  color: var(--ink-mid);
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: -9px;
  left: 0;
  height: 1px;
  content: "";
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}

.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-nav a[aria-current="page"] {
  color: var(--ink);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--rule-strong);
  background: transparent;
  cursor: pointer;
}

.menu-toggle span,
.menu-toggle::before,
.menu-toggle::after {
  display: block;
  width: 18px;
  height: 1px;
  margin: 5px auto;
  content: "";
  background: var(--ink);
}

.page-shell {
  width: min(var(--max), calc(100% - 64px));
  margin: 0 auto;
}

.hero {
  display: grid;
  min-height: 560px;
  padding: 72px 0 56px;
  align-items: center;
  grid-template-columns: minmax(0, 1.02fr) minmax(460px, 0.98fr);
  gap: 66px;
}

.hero h1 {
  max-width: 680px;
  margin: 0 0 31px;
  font-family: var(--font-display);
  font-size: clamp(54px, 5.2vw, 78px);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 1.04;
  text-wrap: balance;
}

.hero h1 span {
  display: block;
  color: var(--accent);
  font-style: italic;
}

.hero-copy {
  max-width: 590px;
  margin: 0 0 33px;
  color: var(--ink-mid);
  font-size: 18px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 24px;
}

.button-primary,
.button-secondary {
  display: inline-flex;
  min-height: 48px;
  padding: 0 23px;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 1px solid var(--accent);
  font-size: 14px;
  font-weight: 750;
  letter-spacing: 0.03em;
  text-decoration: none;
  transition: color 180ms ease, background 180ms ease, transform 180ms ease;
}

.button-primary {
  color: #fff;
  background: var(--accent);
}

.button-primary:hover {
  color: #fff;
  background: #163fb5;
  transform: translateY(-2px);
}

.button-secondary {
  padding-right: 5px;
  padding-left: 5px;
  border-color: transparent;
  border-bottom-color: var(--ink);
  color: var(--ink);
}

.button-secondary:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.arrow-icon {
  display: inline-block;
  width: 22px;
  height: 10px;
}

.hero-visual {
  position: relative;
  min-height: 445px;
}

.hero-visual::before {
  position: absolute;
  z-index: -1;
  inset: 0;
  content: "";
  opacity: 0.33;
  background-image: linear-gradient(var(--rule) 1px, transparent 1px), linear-gradient(90deg, var(--rule) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(to right, transparent, #000 18%, #000 82%, transparent);
}

.hero-diagram {
  width: 100%;
  height: auto;
  overflow: visible;
}

.diagram-flow {
  stroke-dasharray: 5 7;
  animation: dash 9s linear infinite;
}

@keyframes dash {
  to { stroke-dashoffset: -72; }
}

.stats-band {
  display: grid;
  padding: 29px 0 31px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--rule-strong);
  grid-template-columns: repeat(3, 1fr);
}

.stat {
  min-height: 103px;
  padding: 0 28px;
  border-left: 1px solid var(--rule);
}

.stat:first-child {
  padding-left: 0;
  border-left: 0;
}

.stat-value {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-size: 53px;
  font-weight: 400;
  letter-spacing: -0.04em;
  line-height: 1;
}

.stat-label {
  color: var(--ink-mid);
  font-size: 13px;
}

.stat-label small {
  display: block;
  margin-top: 3px;
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.quick-jump {
  display: flex;
  padding: 21px 0;
  align-items: center;
  gap: 26px;
  border-bottom: 1px solid var(--ink);
  overflow-x: auto;
  scrollbar-width: thin;
}

.quick-jump-label {
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.17em;
  white-space: nowrap;
}

.quick-jump a {
  color: var(--ink-mid);
  font-size: 13px;
  font-weight: 650;
  text-decoration: none;
  white-space: nowrap;
}

.quick-jump a span {
  margin-right: 5px;
  color: var(--accent);
  font-family: var(--font-display);
  font-style: italic;
}

.section-heading {
  display: grid;
  margin: 0 0 48px;
  align-items: end;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.55fr);
  gap: 40px;
}

.section-heading h2,
.page-intro h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(43px, 5vw, 70px);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.08;
}

.section-heading p,
.page-intro > p {
  margin: 0;
  color: var(--ink-mid);
  line-height: 1.78;
}

.learning-map-section {
  padding: 112px 0 90px;
}

.stage-map {
  position: relative;
  border-top: 1px solid var(--ink);
}

.stage-row {
  display: grid;
  min-height: 242px;
  padding: 34px 0;
  align-items: start;
  border-bottom: 1px solid var(--rule-strong);
  grid-template-columns: 132px minmax(220px, 0.7fr) minmax(0, 1.6fr);
  gap: 34px;
}

.stage-number {
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 73px;
  font-style: italic;
  font-weight: 400;
  line-height: 0.9;
}

.stage-meta {
  padding-right: 28px;
  border-right: 1px solid var(--rule);
}

.stage-meta .mono-label,
.stage-time,
.chapter-kicker,
.block-label,
.eyeline,
.toc-label {
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 650;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.stage-meta h3 {
  margin: 12px 0 12px;
  font-family: var(--font-display);
  font-size: 29px;
  font-weight: 520;
  line-height: 1.22;
}

.stage-meta p {
  margin: 0 0 15px;
  color: var(--ink-mid);
  font-size: 14px;
  line-height: 1.68;
}

.stage-output {
  display: inline-flex;
  padding: 5px 8px;
  border: 1px solid var(--rule-strong);
  background: var(--paper-2);
  color: var(--ink-mid);
  font-family: var(--font-mono);
  font-size: 10px;
}

.chapter-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 26px;
}

.chapter-list a {
  display: grid;
  padding: 12px 0;
  align-items: baseline;
  border-bottom: 1px dotted var(--rule-strong);
  grid-template-columns: 42px minmax(0, 1fr) 24px;
  gap: 8px;
  text-decoration: none;
}

.chapter-list a:hover .chapter-name {
  color: var(--accent);
}

.chapter-index {
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 10px;
}

.chapter-name {
  color: var(--ink-mid);
  font-size: 14px;
  line-height: 1.45;
}

.chapter-check {
  position: relative;
  width: 16px;
  height: 16px;
  border: 1px solid var(--rule-strong);
}

.chapter-check.is-complete {
  border-color: var(--green);
  background: var(--green);
}

.chapter-check.is-complete::after {
  position: absolute;
  top: 1px;
  left: 4px;
  width: 4px;
  height: 8px;
  content: "";
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.site-footer {
  margin-top: 110px;
  padding: 48px 0 54px;
  border-top: 1px solid var(--ink);
  background: var(--paper-2);
}

.footer-inner {
  display: grid;
  width: min(var(--max), calc(100% - 64px));
  margin: 0 auto;
  grid-template-columns: 1fr auto;
  gap: 40px;
}

.footer-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 27px;
}

.footer-copy {
  max-width: 610px;
  margin: 0;
  color: var(--ink-mute);
  font-size: 13px;
}

.footer-links {
  display: flex;
  align-items: start;
  gap: 24px;
  font-size: 13px;
}

.page-intro {
  display: grid;
  padding: 92px 0 64px;
  border-bottom: 1px solid var(--ink);
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.55fr);
  gap: 60px;
}

.page-intro .eyeline {
  display: block;
  margin-bottom: 18px;
  color: var(--accent);
}

.page-intro h1 {
  max-width: 820px;
}

.page-intro > p {
  align-self: end;
}

.roadmap-grid {
  padding-top: 68px;
}

.roadmap-stage {
  display: grid;
  padding: 35px 0 42px;
  border-bottom: 1px solid var(--rule-strong);
  grid-template-columns: 95px minmax(220px, 0.65fr) minmax(0, 1.35fr);
  gap: 30px;
}

.roadmap-stage .stage-number {
  font-size: 58px;
}

.roadmap-stage h2 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 31px;
  font-weight: 520;
}

.roadmap-stage p {
  margin: 0;
  color: var(--ink-mid);
  font-size: 14px;
}

.roadmap-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.roadmap-table th,
.roadmap-table td {
  padding: 10px 8px;
  border-bottom: 1px dotted var(--rule-strong);
  text-align: left;
  vertical-align: top;
}

.roadmap-table th {
  width: 116px;
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.bridge-band {
  display: grid;
  margin: 34px 0;
  padding: 24px 26px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  grid-template-columns: 150px 1fr;
  gap: 22px;
}

.bridge-band h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 550;
}

.bridge-band p {
  margin: 0;
  color: var(--ink-mid);
  font-size: 14px;
}

.lesson-progress-bar {
  position: fixed;
  z-index: 120;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--accent);
  transition: width 80ms linear;
}

.lesson-shell {
  display: grid;
  width: min(1460px, calc(100% - 48px));
  margin: 0 auto;
  padding: 42px 0 0;
  align-items: start;
  grid-template-columns: 220px minmax(0, var(--reading)) 210px;
  justify-content: center;
  gap: 48px;
}

.lesson-toc,
.lesson-aside {
  position: sticky;
  top: calc(var(--header-h) + 30px);
  max-height: calc(100vh - var(--header-h) - 60px);
  overflow-y: auto;
  scrollbar-width: thin;
}

.lesson-toc {
  padding-right: 22px;
  border-right: 1px solid var(--rule);
}

.lesson-toc ol {
  margin: 13px 0 0;
  padding: 0;
  list-style: none;
}

.lesson-toc a {
  display: block;
  padding: 7px 0 7px 14px;
  border-left: 1px solid var(--rule-strong);
  color: var(--ink-mute);
  font-size: 12px;
  line-height: 1.45;
  text-decoration: none;
}

.lesson-toc a:hover,
.lesson-toc a.is-active {
  border-left-color: var(--accent);
  color: var(--ink);
}

.lesson-aside {
  padding-left: 18px;
  border-left: 1px solid var(--rule);
}

.aside-progress {
  margin-bottom: 30px;
}

.aside-progress strong {
  display: block;
  margin: 8px 0 12px;
  font-family: var(--font-display);
  font-size: 31px;
  font-weight: 500;
}

.progress-track {
  height: 3px;
  background: var(--rule);
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--accent);
}

.aside-note {
  padding: 18px 0;
  border-top: 1px solid var(--rule-strong);
}

.aside-note h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 550;
}

.aside-note p {
  margin: 0;
  color: var(--ink-mid);
  font-size: 12px;
  line-height: 1.7;
}

.evidence-rail-card code {
  color: var(--ink-mid);
  background: transparent;
  font-size: 11px;
}

.evidence-rail-card small {
  color: var(--ink-mute);
  font-size: 10px;
  line-height: 1.55;
}

.evidence-rail-card .gate-blocked {
  color: var(--red);
  font-family: var(--font-mono);
  font-size: 18px;
  letter-spacing: .08em;
}

.lesson-main {
  min-width: 0;
  font-size: 17px;
  line-height: 1.82;
}

.breadcrumb {
  display: flex;
  margin-bottom: 34px;
  align-items: center;
  gap: 9px;
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.breadcrumb a {
  text-decoration: none;
}

.chapter-header {
  padding-bottom: 39px;
  border-bottom: 1px solid var(--ink);
}

.chapter-header h1 {
  margin: 0 0 25px;
  font-family: var(--font-display);
  font-size: clamp(42px, 3.8vw, 52px);
  font-weight: 500;
  letter-spacing: -0.04em;
  line-height: 1.09;
}

.chapter-meta {
  display: flex;
  padding: 12px 0;
  align-items: center;
  gap: 14px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  color: var(--ink-mid);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.chapter-meta .meta-accent {
  color: var(--accent);
}

.chapter-opening {
  margin: 50px 0 55px;
  font-family: var(--font-display);
  font-size: 24px;
  line-height: 1.65;
}

.chapter-opening p {
  margin: 0;
}

.learning-objectives {
  margin: 40px 0 54px;
  padding: 23px 26px;
  border-left: 3px solid var(--accent);
  background: var(--paper-2);
}

.learning-objectives h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 560;
}

.learning-objectives ul {
  margin: 0;
  padding-left: 20px;
}

.anchor-grid {
  display: grid;
  margin: 0 0 68px;
  border-top: 1px solid var(--ink);
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.anchor-card {
  min-height: 190px;
  padding: 23px 20px 23px 0;
  border-right: 1px solid var(--rule);
}

.anchor-card + .anchor-card {
  padding-left: 20px;
}

.anchor-card:last-child {
  border-right: 0;
}

.anchor-card .anchor-number {
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 34px;
  font-style: italic;
}

.anchor-card h3 {
  margin: 12px 0 7px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 560;
}

.anchor-card p {
  margin: 0;
  color: var(--ink-mid);
  font-size: 13px;
  line-height: 1.65;
}

.lesson-section {
  margin: 0 0 78px;
}

.lesson-section > h2 {
  display: flex;
  margin: 0 0 27px;
  padding-bottom: 14px;
  align-items: baseline;
  border-bottom: 1px solid var(--rule-strong);
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 520;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

.lesson-section > h2::before {
  width: 28px;
  height: 1px;
  margin-right: 12px;
  content: "";
  background: var(--accent);
}

.lesson-section h3 {
  margin: 35px 0 12px;
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 560;
}

.lesson-section p {
  margin: 0 0 18px;
}

.lesson-section ul,
.lesson-section ol {
  margin: 16px 0 24px;
  padding-left: 25px;
}

.lesson-section li {
  margin-bottom: 7px;
}

.formula {
  display: block;
  margin: 25px 0;
  padding: 22px 24px;
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
  background: var(--paper-2);
  font-family: var(--font-display);
  font-size: 22px;
  font-style: italic;
  text-align: center;
  overflow-x: auto;
}

code {
  padding: 0.12em 0.32em;
  color: #264f77;
  background: var(--blue-soft);
  font-family: var(--font-mono);
  font-size: 0.88em;
}

pre {
  position: relative;
  margin: 24px 0;
  padding: 24px;
  border: 1px solid #1d3045;
  background: #0f2032;
  color: #e7edf3;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.65;
  overflow-x: auto;
}

pre code {
  padding: 0;
  color: inherit;
  background: transparent;
  font-size: inherit;
}

.copy-code {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 5px 8px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: #fff;
  background: rgba(255, 255, 255, 0.07);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  cursor: pointer;
}

.worked-example,
.concept-block,
.warning-block,
.debug-block {
  margin: 29px 0;
  padding: 24px 27px;
  border-left: 3px solid var(--blue);
  background: var(--blue-soft);
}

.worked-example {
  border-left-color: var(--accent);
  background: var(--accent-soft);
}

.warning-block {
  border-left-color: var(--red);
  background: var(--red-soft);
}

.debug-block {
  border-left-color: var(--green);
  background: var(--green-soft);
}

.worked-example > :last-child,
.concept-block > :last-child,
.warning-block > :last-child,
.debug-block > :last-child {
  margin-bottom: 0;
}

.worked-example .block-label,
.concept-block .block-label,
.warning-block .block-label,
.debug-block .block-label {
  display: block;
  margin-bottom: 10px;
  color: currentColor;
}

.teaching-figure {
  margin: 38px 0 42px;
}

.teaching-figure-frame {
  padding: 14px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--rule-strong);
  background: var(--paper);
}

.teaching-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.teaching-figure figcaption {
  margin-top: 12px;
  color: var(--ink-mute);
  font-size: 12px;
  line-height: 1.65;
}

.check-yourself {
  margin: 33px 0;
  padding: 23px 26px;
  border: 1px solid var(--rule-strong);
}

.check-yourself summary,
.answer-reveal summary {
  color: var(--ink);
  font-weight: 750;
  cursor: pointer;
}

.check-yourself[open] summary,
.answer-reveal[open] summary {
  margin-bottom: 13px;
}

.misconceptions,
.practice-section,
.mastery-section,
.stuck-section {
  margin: 76px 0;
  padding-top: 35px;
  border-top: 1px solid var(--ink);
}

.misconceptions > h2,
.practice-section > h2,
.mastery-section > h2,
.stuck-section > h2 {
  margin: 0 0 26px;
  font-family: var(--font-display);
  font-size: 38px;
  font-weight: 520;
}

.misconception-list {
  border-top: 1px solid var(--rule);
}

.misconception-item {
  display: grid;
  padding: 21px 0;
  border-bottom: 1px solid var(--rule);
  grid-template-columns: 220px 1fr;
  gap: 28px;
}

.misconception-item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 560;
}

.misconception-item p {
  margin: 0;
  color: var(--ink-mid);
}

.stuck-steps {
  counter-reset: stuck;
  margin: 0;
  padding: 0;
  list-style: none;
}

.stuck-steps li {
  display: grid;
  padding: 14px 0;
  border-bottom: 1px dotted var(--rule-strong);
  grid-template-columns: 42px 1fr;
  gap: 12px;
}

.stuck-steps li::before {
  color: var(--accent);
  content: "0" counter(stuck);
  counter-increment: stuck;
  font-family: var(--font-display);
  font-size: 22px;
  font-style: italic;
}

.practice-list {
  display: grid;
  gap: 26px;
}

.practice-card {
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
  background: var(--paper-2);
}

.practice-head {
  display: grid;
  padding: 21px 24px;
  align-items: baseline;
  grid-template-columns: 62px 1fr;
  gap: 14px;
  background: var(--paper-3);
}

.practice-number {
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 31px;
  font-style: italic;
}

.practice-head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 550;
}

.practice-body {
  display: grid;
  padding: 23px 24px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 30px;
}

.practice-field strong {
  display: block;
  margin-bottom: 4px;
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.practice-field p {
  margin: 0;
  color: var(--ink-mid);
  font-size: 14px;
}

.answer-reveal {
  grid-column: 1 / -1;
  padding: 14px 0 0;
  border-top: 1px dotted var(--rule-strong);
}

.answer-reveal p {
  margin: 8px 0 0;
}

.mastery-section {
  padding: 35px 31px 31px;
  border: 1px solid var(--ink);
  background: var(--paper);
}

.mastery-section > h2 {
  margin-top: 0;
}

.chapter-summary {
  margin: 76px 0 36px;
  padding: 34px 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.chapter-summary h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 520;
}

.chapter-summary ul {
  margin: 0;
  padding-left: 21px;
}

.completion-control {
  display: flex;
  margin: 37px 0;
  padding: 22px 0;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.complete-button {
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--green);
  color: var(--green);
  background: transparent;
  font-weight: 750;
  cursor: pointer;
}

.complete-button.is-complete {
  color: #fff;
  background: var(--green);
}

.chapter-navigation {
  display: grid;
  margin-top: 45px;
  border-top: 1px solid var(--rule-strong);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.chapter-navigation a {
  min-height: 116px;
  padding: 24px 0;
  text-decoration: none;
}

.chapter-navigation a + a {
  padding-left: 28px;
  border-left: 1px solid var(--rule);
  text-align: right;
}

.chapter-navigation small {
  display: block;
  margin-bottom: 7px;
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.chapter-navigation strong {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 550;
}

.paper-track {
  padding-top: 62px;
}

.paper-item {
  display: grid;
  padding: 40px 0 48px;
  border-bottom: 1px solid var(--rule-strong);
  grid-template-columns: 130px minmax(260px, 0.65fr) minmax(0, 1.35fr);
  gap: 34px;
}

.paper-index {
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 60px;
  font-style: italic;
  line-height: 1;
}

.paper-meta h2 {
  margin: 6px 0 12px;
  font-family: var(--font-display);
  font-size: 29px;
  font-weight: 540;
  line-height: 1.28;
}

.paper-meta p {
  margin: 0 0 12px;
  color: var(--ink-mid);
  font-size: 14px;
}

.paper-link {
  color: var(--accent);
  font-size: 13px;
  font-weight: 750;
}

.paper-guide {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 17px 25px;
}

.paper-guide section {
  padding-top: 10px;
  border-top: 1px dotted var(--rule-strong);
}

.paper-guide h3 {
  margin: 0 0 5px;
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.paper-guide p,
.paper-guide ul {
  margin: 0;
  color: var(--ink-mid);
  font-size: 13px;
}

.paper-guide ul {
  padding-left: 18px;
}

.project-hero {
  display: grid;
  margin: 64px 0 0;
  padding: 40px 0 56px;
  border-bottom: 1px solid var(--ink);
  grid-template-columns: 0.82fr 1.18fr;
  gap: 60px;
}

.project-hero h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 46px;
  font-weight: 500;
  line-height: 1.12;
}

.project-hero p {
  margin: 0;
  color: var(--ink-mid);
  font-size: 18px;
}

.project-tracks {
  display: grid;
  margin: 48px 0 68px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--rule-strong);
}

.project-track {
  min-height: 270px;
  padding: 28px 27px;
  border-right: 1px solid var(--rule);
}

.project-track:last-child {
  border-right: 0;
}

.project-track.is-recommended {
  background: var(--accent-soft);
}

.project-track.is-recommended .eyeline {
  color: var(--accent);
}

.project-track h3 {
  margin: 18px 0 11px;
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 550;
}

.project-track p {
  margin: 0 0 18px;
  color: var(--ink-mid);
  font-size: 14px;
}

.project-checklist {
  display: grid;
  margin: 32px 0 66px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 36px;
}

.project-check {
  display: grid;
  padding: 15px 0;
  border-bottom: 1px dotted var(--rule-strong);
  grid-template-columns: 26px 1fr;
  gap: 12px;
}

.project-check::before {
  width: 15px;
  height: 15px;
  margin-top: 5px;
  border: 1px solid var(--green);
  content: "";
}

.gate-grid {
  display: grid;
  margin: 32px 0 76px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--rule-strong);
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.gate-grid article {
  min-height: 205px;
  padding: 25px 22px;
  border-right: 1px solid var(--rule);
}

.gate-grid article:last-child { border-right: 0; }
.gate-grid span { color: var(--accent); font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.12em; }
.gate-grid h3 { margin: 32px 0 12px; font-family: var(--font-display); font-size: 25px; }
.gate-grid p { margin: 0; color: var(--ink-mute); font-size: 13px; }

.rubric-table {
  width: 100%;
  margin: 27px 0 66px;
  border-collapse: collapse;
}

.rubric-table th,
.rubric-table td {
  padding: 15px 14px;
  border-top: 1px solid var(--rule-strong);
  text-align: left;
}

.rubric-table th {
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.rubric-table td:last-child {
  font-family: var(--font-display);
  font-size: 25px;
  text-align: right;
}

.glossary-tools {
  position: sticky;
  z-index: 20;
  top: var(--header-h);
  display: flex;
  padding: 20px 0;
  border-bottom: 1px solid var(--rule-strong);
  background: rgba(255, 255, 255, 0.96);
  align-items: center;
  gap: 20px;
}

.glossary-search {
  flex: 1;
  height: 48px;
  padding: 0 16px;
  border: 1px solid var(--rule-strong);
  border-radius: 0;
  background: var(--paper);
}

.glossary-count {
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 10px;
  white-space: nowrap;
}

.glossary-list {
  margin-top: 32px;
  border-top: 1px solid var(--ink);
}

.glossary-item {
  display: grid;
  padding: 28px 0 31px;
  border-bottom: 1px solid var(--rule-strong);
  grid-template-columns: 0.66fr 1.34fr;
  gap: 44px;
}

.glossary-item[hidden] {
  display: none;
}

.glossary-item h2 {
  margin: 0 0 5px;
  font-family: var(--font-display);
  font-size: 29px;
  font-weight: 550;
}

.glossary-en {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.glossary-body p {
  margin: 0 0 10px;
  color: var(--ink-mid);
}

.glossary-links {
  color: var(--ink-mute);
  font-size: 12px;
}

.callout-band {
  margin: 68px 0;
  padding: 38px 42px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  background: var(--paper-2);
}

.callout-band h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 520;
}

.callout-band p {
  max-width: 850px;
  margin: 0;
  color: var(--ink-mid);
}

.empty-state {
  padding: 48px 0;
  color: var(--ink-mute);
  text-align: center;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 560ms ease, transform 560ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

@media (max-width: 1180px) {
  .hero {
    grid-template-columns: minmax(0, 0.95fr) minmax(420px, 1.05fr);
    gap: 35px;
  }

  .lesson-shell {
    grid-template-columns: 205px minmax(0, var(--reading));
    gap: 36px;
  }

  .lesson-aside {
    display: none;
  }
}

@media (max-width: 960px) {
  :root { --header-h: 64px; }

  .header-inner,
  .page-shell,
  .footer-inner {
    width: min(100% - 40px, var(--max));
  }

  .brand-note { display: none; }

  .site-nav {
    position: fixed;
    z-index: 99;
    inset: var(--header-h) 0 auto;
    display: none;
    padding: 25px 20px 30px;
    border-bottom: 1px solid var(--ink);
    background: var(--paper);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav.is-open { display: flex; }

  .site-nav a {
    padding: 13px 0;
    border-bottom: 1px solid var(--rule);
  }

  .site-nav a::after { display: none; }

  .menu-toggle { display: block; }

  .hero {
    min-height: auto;
    padding: 68px 0 55px;
    grid-template-columns: 1fr;
  }

  .hero-copy { max-width: 690px; }

  .hero-visual {
    max-width: 690px;
    min-height: 0;
    margin: 0 auto;
  }

  .section-heading,
  .page-intro {
    grid-template-columns: 1fr;
    gap: 25px;
  }

  .stage-row,
  .roadmap-stage {
    grid-template-columns: 92px minmax(210px, 0.58fr) minmax(0, 1.42fr);
    gap: 22px;
  }

  .stage-number { font-size: 58px; }

  .chapter-list { grid-template-columns: 1fr; }

  .lesson-shell {
    width: min(100% - 40px, var(--reading));
    grid-template-columns: 1fr;
  }

  .lesson-toc {
    position: static;
    max-height: none;
    padding: 0 0 21px;
    border-right: 0;
    border-bottom: 1px solid var(--rule);
  }

  .lesson-toc ol {
    display: flex;
    gap: 8px;
    overflow-x: auto;
  }

  .lesson-toc a {
    min-width: 175px;
    padding: 8px 10px;
    border: 1px solid var(--rule);
  }

  .paper-item {
    grid-template-columns: 90px minmax(0, 1fr);
  }

  .paper-guide {
    grid-column: 2;
  }
}

@media (max-width: 720px) {
  body { font-size: 15px; }

  .header-inner,
  .page-shell,
  .footer-inner,
  .lesson-shell {
    width: min(100% - 28px, var(--max));
  }

  .brand-name { font-size: 19px; }

  .hero { padding-top: 49px; }

  .hero h1 {
    margin-bottom: 24px;
    font-size: clamp(46px, 14vw, 65px);
  }

  .hero-copy { font-size: 16px; }

  .hero-actions { align-items: stretch; flex-direction: column; gap: 12px; }

  .button-primary,
  .button-secondary { width: 100%; }

  .hero-visual { margin-top: 10px; }

  .stats-band { grid-template-columns: repeat(2, 1fr); }

  .stat {
    min-height: 98px;
    padding: 15px 16px;
    border-bottom: 1px solid var(--rule);
  }

  .stat:nth-child(odd) { padding-left: 0; border-left: 0; }
  .stat:nth-child(even) { padding-right: 0; }

  .stat-value { font-size: 43px; }

  .learning-map-section { padding: 76px 0 40px; }

  .section-heading h2,
  .page-intro h1 { font-size: 43px; }

  .stage-row,
  .roadmap-stage {
    padding: 30px 0;
    grid-template-columns: 64px 1fr;
    gap: 18px;
  }

  .stage-number { font-size: 47px; }

  .stage-meta {
    padding-right: 0;
    border-right: 0;
  }

  .chapter-list,
  .roadmap-table,
  .roadmap-stage > :last-child {
    grid-column: 2;
  }

  .stage-row .chapter-list { grid-column: 2; }

  .page-intro { padding: 60px 0 44px; }

  .bridge-band { grid-template-columns: 1fr; }

  .lesson-shell { padding-top: 28px; }

  .chapter-header h1 { font-size: 48px; }

  .chapter-meta { align-items: center; flex-flow: row wrap; gap: 5px 10px; }
  .chapter-meta .meta-separator { display: none; }

  .chapter-opening { margin: 36px 0 40px; font-size: 22px; }

  .anchor-grid { grid-template-columns: 1fr; }

  .anchor-card,
  .anchor-card + .anchor-card {
    min-height: 0;
    padding: 18px 0;
    border-right: 0;
    border-bottom: 1px solid var(--rule);
  }

  .lesson-section > h2,
  .misconceptions > h2,
  .practice-section > h2,
  .mastery-section > h2,
  .stuck-section > h2 { font-size: 31px; }

  .formula { font-size: 19px; }

  pre { margin-right: -14px; margin-left: -14px; padding: 18px 14px; }

  .misconception-item { grid-template-columns: 1fr; gap: 7px; }

  .practice-body { grid-template-columns: 1fr; }
  .answer-reveal { grid-column: 1; }

  .chapter-navigation { grid-template-columns: 1fr; }
  .chapter-navigation a + a { padding-left: 0; border-top: 1px solid var(--rule); border-left: 0; text-align: left; }

  .paper-item { grid-template-columns: 64px 1fr; gap: 18px; }
  .paper-index { font-size: 46px; }
  .paper-guide { grid-column: 1 / -1; grid-template-columns: 1fr; }

  .project-hero { grid-template-columns: 1fr; gap: 22px; }
  .project-tracks { grid-template-columns: 1fr; }
  .project-track { min-height: 0; border-right: 0; border-bottom: 1px solid var(--rule); }
  .project-checklist { grid-template-columns: 1fr; }

  .glossary-item { grid-template-columns: 1fr; gap: 18px; }
  .glossary-tools { align-items: stretch; flex-direction: column; gap: 9px; }

  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { flex-wrap: wrap; }
}

/* AI Infra course composition — desktop-first additions */

.site-nav a.is-active {
  color: var(--ink);
}

.site-nav a.is-active::after {
  transform: scaleX(1);
}

.header-cta {
  display: inline-flex;
  padding: 9px 0 7px;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--ink);
  font-size: 12px;
  font-weight: 750;
  text-decoration: none;
  white-space: nowrap;
}

.header-cta svg,
.stage-row > svg,
.button-primary svg,
.button-secondary svg {
  width: 20px;
  height: 12px;
}

.agent-hero {
  display: block;
  width: min(var(--max), calc(100% - 64px));
  margin: 0 auto;
  padding: 42px 0 0;
}

.hero-grid {
  display: grid;
  min-height: 500px;
  align-items: center;
  grid-template-columns: minmax(0, 1.05fr) minmax(470px, .95fr);
  gap: 70px;
}

.hero-grid > .hero-copy {
  max-width: none;
  margin: 0;
}

.hero-grid > .hero-copy > p:not(.hero-note) {
  max-width: 650px;
  color: var(--ink-mid);
  font-size: 18px;
  line-height: 1.78;
}

.hero-facts {
  display: grid;
  margin-top: 46px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--rule-strong);
  grid-template-columns: repeat(4, 1fr);
}

.hero-facts div {
  min-height: 92px;
  padding: 21px 22px;
  border-right: 1px solid var(--rule);
}

.hero-facts div:first-child { padding-left: 0; }
.hero-facts div:last-child { border-right: 0; }
.hero-facts span { display: block; color: var(--ink-soft); font-family: var(--font-mono); font-size: 9px; letter-spacing: .13em; }
.hero-facts strong { display: block; margin-top: 10px; font-family: var(--font-display); font-size: 20px; font-weight: 520; }

.agent-trace > .trace-step {
  display: grid;
  min-height: 62px;
  padding: 11px 17px;
  border-bottom: 1px solid var(--rule);
  grid-template-columns: 66px 84px 1fr;
  align-items: center;
  gap: 12px;
}

.agent-trace > .trace-step::after { display: none; }
.agent-trace > .trace-step span { color: var(--ink-soft); font-size: 9px; }
.agent-trace > .trace-step b { margin: 0; font-size: 10px; letter-spacing: .1em; }
.agent-trace > .trace-step p { margin: 0; color: var(--ink-mute); font-size: 10px; line-height: 1.45; }
.agent-trace .trace-footer { display: block; padding: 15px 17px 17px; }
.agent-trace .trace-footer span { display: block; margin-bottom: 5px; color: var(--accent); }
.agent-trace .trace-footer strong { color: var(--ink); font-family: var(--font-body); font-size: 13px; }

.principles {
  display: grid;
  margin: 108px 0 112px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  grid-template-columns: repeat(3, 1fr);
}

.principles article {
  min-height: 245px;
  padding: 28px 30px;
  border-right: 1px solid var(--rule-strong);
}

.principles article:first-child { padding-left: 0; }
.principles article:last-child { padding-right: 0; border-right: 0; }
.principles span { color: var(--accent); font-family: var(--font-mono); font-size: 9px; letter-spacing: .13em; }
.principles h2,
.principles h3 { margin: 48px 0 14px; font-family: var(--font-display); font-size: 27px; }
.principles p { margin: 0; color: var(--ink-mute); font-size: 14px; }

.curriculum-section { padding: 8px 0 34px; }
.curriculum-section .stage-row {
  min-height: 132px;
  padding: 24px 6px;
  align-items: center;
  grid-template-columns: 92px 1fr 90px 28px;
  gap: 24px;
  color: var(--ink);
  text-decoration: none;
}

.curriculum-section .stage-row-number { color: var(--accent); font-family: var(--font-display); font-size: 52px; font-style: italic; line-height: 1; }
.curriculum-section .stage-row small { display: block; color: var(--ink-soft); font-family: var(--font-mono); font-size: 9px; letter-spacing: .12em; }
.curriculum-section .stage-row strong { display: block; margin-top: 8px; font-family: var(--font-display); font-size: 27px; font-weight: 520; }
.curriculum-section .stage-row-chapters { color: var(--ink-mute); font-family: var(--font-mono); font-size: 12px; }

.reading-list { margin: 0 0 90px; border-top: 1px solid var(--ink); }
.reading-item { display: grid; padding: 32px 0; border-bottom: 1px solid var(--rule-strong); grid-template-columns: 74px 1fr; gap: 28px; }
.reading-index { color: var(--accent); font-family: var(--font-display); font-size: 38px; font-style: italic; }
.reading-item h2 { margin: 8px 0 10px; font-family: var(--font-display); font-size: 31px; font-weight: 520; }
.reading-item > div > p { margin: 0 0 20px; color: var(--ink-mid); }
.reading-item dl { display: grid; margin: 0 0 18px; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.reading-item dl div { padding-top: 12px; border-top: 1px dotted var(--rule-strong); }
.reading-item dt { color: var(--ink-soft); font-family: var(--font-mono); font-size: 9px; letter-spacing: .1em; }
.reading-item dd { margin: 7px 0 0; color: var(--ink-mid); font-size: 13px; }

.capstone-grid { display: grid; margin: 48px 0 90px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--rule-strong); grid-template-columns: repeat(3, 1fr); }
.capstone-card { min-height: 300px; padding: 28px; border-right: 1px solid var(--rule); }
.capstone-card:first-child { padding-left: 0; }
.capstone-card:last-child { padding-right: 0; border-right: 0; }
.capstone-card.is-recommended { background: var(--accent-soft); }
.capstone-card h2 { margin: 28px 0 13px; font-family: var(--font-display); font-size: 31px; font-weight: 520; }
.capstone-card p { color: var(--ink-mid); }
.capstone-flow { margin-top: 36px; color: var(--ink-mute); font-family: var(--font-mono); font-size: 11px; line-height: 1.8; }

.route-gate-section { margin: 30px 0 90px; }
.route-gate-grid { display: grid; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--rule-strong); grid-template-columns: repeat(3, 1fr); }
.route-gate-grid article { min-height: 300px; padding: 28px; border-right: 1px solid var(--rule); }
.route-gate-grid article:first-child { padding-left: 0; }
.route-gate-grid article:last-child { padding-right: 0; border-right: 0; }
.route-gate-grid h3 { margin: 28px 0 20px; font-family: var(--font-display); font-size: 25px; font-weight: 520; }
.route-gate-grid p { color: var(--ink-mid); font-size: 13px; }

.project-gates { margin: 0 0 92px; }
.gate-row { display: grid; min-height: 130px; padding: 24px 0; border-top: 1px solid var(--rule-strong); grid-template-columns: 80px 1fr; gap: 28px; }
.gate-row:last-child { border-bottom: 1px solid var(--rule-strong); }
.gate-row > span { color: var(--accent); font-family: var(--font-display); font-size: 34px; }
.gate-row h3 { margin: 0 0 8px; font-family: var(--font-display); font-size: 26px; }
.gate-row p { margin: 0 0 7px; color: var(--ink-mid); }
.gate-row small { color: var(--green); }

.rubric-section { margin-bottom: 84px; }
.rubric-section .rubric-table { display: grid; margin-top: 0; border-top: 1px solid var(--ink); grid-template-columns: repeat(2, 1fr); }
.rubric-section .rubric-table > div { display: grid; min-height: 112px; padding: 18px 20px; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); grid-template-columns: 1fr 50px; gap: 5px 16px; }
.rubric-section .rubric-table > div:nth-child(2n) { border-right: 0; }
.rubric-section .rubric-table strong { font-family: var(--font-display); font-size: 20px; }
.rubric-section .rubric-table span { color: var(--accent); font-family: var(--font-display); font-size: 25px; text-align: right; }
.rubric-section .rubric-table p { grid-column: 1 / -1; margin: 5px 0 0; color: var(--ink-mute); font-size: 13px; }

.role-matrix { margin: 0 0 90px; }
.matrix-table { border-top: 1px solid var(--ink); }
.matrix-row { display: grid; min-height: 76px; padding: 13px 0; align-items: center; border-bottom: 1px solid var(--rule); grid-template-columns: 1.05fr 1.45fr 1.25fr .8fr; gap: 20px; }
.matrix-row span { color: var(--ink-mid); font-size: 13px; }
.matrix-row span:first-child { color: var(--ink); font-weight: 750; }
.matrix-head { min-height: 48px; }
.matrix-head span { color: var(--ink-soft) !important; font-family: var(--font-mono); font-size: 9px; letter-spacing: .1em; }

.packet-list { display: grid; margin: 0 0 90px; border-top: 1px solid var(--ink); grid-template-columns: repeat(3, 1fr); }
.packet-list .section-heading { grid-column: 1 / -1; margin: 0; padding: 60px 0 42px; }
.packet-list article { min-height: 220px; padding: 25px 24px; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.packet-list article:nth-of-type(3n + 1) { padding-left: 0; }
.packet-list article:nth-of-type(3n) { padding-right: 0; border-right: 0; }
.packet-list article > span { color: var(--accent); font-family: var(--font-mono); font-size: 10px; }
.packet-list h3 { margin: 34px 0 10px; font-family: var(--font-display); font-size: 24px; }
.packet-list p { margin: 0; color: var(--ink-mute); font-size: 13px; }

.glossary-search { position: sticky; z-index: 20; top: var(--header-h); display: grid; height: auto; margin: 0 0 30px; padding: 18px 0; border: 0; border-bottom: 1px solid var(--rule-strong); background: rgba(255,255,255,.97); grid-template-columns: 110px 1fr 90px; align-items: center; gap: 16px; }
.glossary-search label { color: var(--ink-mute); font-family: var(--font-mono); font-size: 10px; letter-spacing: .1em; }
.glossary-search input { height: 46px; padding: 0 14px; border: 1px solid var(--rule-strong); border-radius: 0; }
.glossary-search span { color: var(--ink-mute); font-family: var(--font-mono); font-size: 10px; text-align: right; }
.glossary-grid { display: grid; margin-bottom: 90px; border-top: 1px solid var(--ink); grid-template-columns: repeat(3, 1fr); }
.glossary-card { min-height: 250px; padding: 24px; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.glossary-card[hidden] { display: none; }
.glossary-card h2 { margin: 26px 0 1px; font-family: var(--font-display); font-size: 25px; font-weight: 520; }
.glossary-card h3 { margin: 0 0 15px; color: var(--accent); font-size: 13px; }
.glossary-card p { color: var(--ink-mid); font-size: 13px; }
.glossary-card > a { color: var(--ink-mute); font-family: var(--font-mono); font-size: 10px; }

@media (max-width: 1360px) {
  .brand-note, .header-cta { display: none; }
  .site-nav { gap: 22px; }
}

/* Agent Field Guide additions */

.agent-brand-mark::before {
  border-radius: 2px;
  transform: rotate(0);
}

.agent-brand-mark::after {
  box-shadow: 0 -7px 0 -1px var(--accent), 7px 0 0 -1px var(--accent);
}

.agent-hero {
  min-height: 680px;
  align-items: center;
}

.agent-hero h1 {
  max-width: 760px;
  font-size: clamp(54px, 4.7vw, 68px);
}

.agent-hero h1 span {
  color: var(--ink);
  font-style: normal;
}

.agent-hero .eyeline {
  display: block;
  margin-bottom: 18px;
  color: var(--accent);
}

.hero-note {
  margin-top: 27px;
  color: var(--ink-mute);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
}

.agent-trace {
  position: relative;
  z-index: 1;
  width: min(100%, 590px);
  margin-left: auto;
  border: 1px solid var(--ink);
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 14px 14px 0 var(--blue-soft);
  font-family: var(--font-mono);
}

.trace-header,
.trace-footer {
  display: flex;
  min-height: 47px;
  padding: 0 17px;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--ink-mute);
  font-size: 10px;
  letter-spacing: 0.1em;
}

.trace-header {
  border-bottom: 1px solid var(--rule-strong);
  color: var(--ink);
  font-weight: 800;
}

.trace-live {
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px var(--green-soft);
}

.trace-budget {
  display: grid;
  padding: 13px 17px;
  border-bottom: 1px solid var(--rule);
  grid-template-columns: 90px 1fr 38px;
  align-items: center;
  gap: 12px;
  color: var(--ink-mute);
  font-size: 9px;
}

.trace-budget div {
  height: 4px;
  overflow: hidden;
  background: var(--paper-3);
}

.trace-budget i {
  display: block;
  height: 100%;
  background: var(--accent);
}

.trace-steps {
  margin: 0;
  padding: 11px 17px 8px;
  list-style: none;
}

.trace-step {
  position: relative;
  display: grid;
  min-height: 48px;
  padding: 7px 0;
  grid-template-columns: 34px 1fr 16px;
  align-items: center;
  gap: 10px;
}

.trace-step:not(:last-child)::after {
  position: absolute;
  z-index: 0;
  top: 35px;
  bottom: -13px;
  left: 12px;
  width: 1px;
  content: "";
  background: var(--rule-strong);
}

.trace-index {
  position: relative;
  z-index: 1;
  display: grid;
  width: 25px;
  height: 25px;
  border: 1px solid var(--rule-strong);
  border-radius: 50%;
  background: var(--paper);
  place-items: center;
  color: var(--ink-mute);
  font-size: 8px;
}

.trace-step b {
  display: block;
  margin-bottom: 2px;
  color: var(--ink);
  font-size: 10px;
  letter-spacing: 0.11em;
}

.trace-step code {
  padding: 0;
  color: var(--ink-mute);
  background: transparent;
  font-size: 10px;
  white-space: normal;
}

.trace-state {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--blue);
}

.trace-step.is-warn .trace-index,
.trace-step.is-risk .trace-index {
  border-color: var(--red);
  color: var(--red);
}

.trace-step.is-warn .trace-state,
.trace-step.is-risk .trace-state { background: var(--red); }
.trace-step.is-done .trace-state { background: var(--green); box-shadow: 0 0 0 4px var(--green-soft); }
.trace-step.is-done b { color: var(--green); }

.trace-footer {
  border-top: 1px solid var(--rule-strong);
}

.trace-footer strong { color: var(--green); }

.principles-section {
  padding: 108px 0 80px;
}

.principle-grid {
  display: grid;
  margin-top: 52px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  grid-template-columns: repeat(4, 1fr);
}

.principle-grid article {
  min-height: 270px;
  padding: 28px 24px;
  border-right: 1px solid var(--rule-strong);
}

.principle-grid article:nth-child(4n) { border-right: 0; }
.principle-grid article:not(:nth-last-child(-n + 4)) { border-bottom: 1px solid var(--rule-strong); }
.principle-grid span { color: var(--accent); font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.13em; }
.principle-grid h3 { margin: 44px 0 15px; font-family: var(--font-display); font-size: 25px; line-height: 1.28; }
.principle-grid p { margin: 0; color: var(--ink-mute); font-size: 14px; }

.role-band {
  display: grid;
  margin: 100px 0;
  padding: 42px 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  grid-template-columns: minmax(240px, 0.7fr) minmax(360px, 1.3fr) auto;
  align-items: center;
  gap: 34px;
}

.role-band h2 { margin: 8px 0 0; font-family: var(--font-display); font-size: 31px; line-height: 1.15; }
.role-list { display: flex; flex-wrap: wrap; gap: 9px; }
.role-list span { padding: 7px 10px; border: 1px solid var(--rule-strong); color: var(--ink-mid); font-size: 12px; }

.diagnostic-layout {
  display: grid;
  padding: 20px 0 100px;
  grid-template-columns: minmax(0, 1fr) 390px;
  align-items: start;
  gap: 68px;
}

.diagnostic-list { border-top: 1px solid var(--ink); }

.diagnostic-item {
  display: grid;
  min-height: 86px;
  padding: 15px 12px;
  border-bottom: 1px solid var(--rule);
  grid-template-columns: 28px 48px 1fr;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: background 160ms ease;
}

.diagnostic-item:hover { background: var(--blue-soft); }
.diagnostic-item input { width: 18px; height: 18px; accent-color: var(--accent); }
.diagnostic-number { color: var(--ink-soft); font-family: var(--font-mono); font-size: 11px; }
.diagnostic-item b { display: block; font-size: 15px; }
.diagnostic-item small { display: block; margin-top: 3px; color: var(--ink-mute); font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.04em; }

.diagnostic-result {
  position: sticky;
  top: calc(var(--header-h) + 28px);
  padding: 31px;
  border: 1px solid var(--ink);
  box-shadow: 12px 12px 0 var(--blue-soft);
}

.diagnostic-live > strong {
  display: block;
  margin: 15px 0 10px;
  font-family: var(--font-display);
  font-size: 60px;
  line-height: 1;
}

.diagnostic-result h2 { margin: 27px 0 10px; font-family: var(--font-display); font-size: 31px; }
.diagnostic-result p { color: var(--ink-mute); }
.diagnostic-result .button-primary { margin-top: 13px; }
.diagnostic-meter { height: 7px; overflow: hidden; background: var(--paper-3); }
.diagnostic-meter span { display: block; width: 0; height: 100%; background: var(--accent); transition: width 220ms ease; }
.button-text { display: block; margin: 18px auto 0; border: 0; color: var(--ink-mute); background: transparent; font-size: 12px; text-decoration: underline; cursor: pointer; }

.source-note {
  display: grid;
  margin: 0 0 70px;
  padding: 22px 0;
  border-top: 1px solid var(--accent);
  border-bottom: 1px solid var(--accent);
  grid-template-columns: 180px 1fr;
  gap: 30px;
}

.source-note strong { color: var(--accent); font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; }
.source-note p { margin: 0; color: var(--ink-mid); }
.project-track code { display: block; margin: 18px 0 26px; padding: 12px; white-space: normal; line-height: 1.65; }

.danger-gate {
  margin: 90px 0 0;
  padding: 36px 40px;
  border: 1px solid var(--red);
  background: var(--red-soft);
}

.danger-gate .eyeline { color: var(--red); }
.danger-gate h2 { margin: 8px 0 18px; font-family: var(--font-display); font-size: 34px; }

.role-table td:first-child { min-width: 190px; font-weight: 750; }

.table-scroll {
  max-width: 100%;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
}

.table-scroll .rubric-table {
  min-width: 760px;
}

.hiring-packet { padding: 105px 0 80px; }
.packet-grid { display: grid; margin-top: 50px; border-top: 1px solid var(--ink); grid-template-columns: repeat(3, 1fr); }
.packet-grid article { min-height: 220px; padding: 25px 24px; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.packet-grid article:nth-child(3n + 1) { padding-left: 0; }
.packet-grid article:nth-child(3n) { padding-right: 0; border-right: 0; }
.packet-grid span { color: var(--accent); font-family: var(--font-mono); font-size: 11px; }
.packet-grid h3 { margin: 35px 0 11px; font-family: var(--font-display); font-size: 25px; }
.packet-grid p { margin: 0; color: var(--ink-mute); font-size: 14px; }

.resume-lab {
  margin: 55px 0 90px;
  padding: 46px;
  color: #fff;
  background: var(--ink);
}

.resume-lab .eyeline { color: #9db6ff; }
.resume-lab h2 { margin: 8px 0 30px; font-family: var(--font-display); font-size: 39px; }
.resume-before, .resume-after { padding: 18px 0; border-top: 1px solid rgba(255, 255, 255, 0.22); }
.resume-after { color: #dce5ff; }
.resume-lab p { margin-bottom: 0; color: #aeb8c5; }

.interview-grid { display: grid; margin: 0 0 90px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); grid-template-columns: repeat(4, 1fr); }
.interview-grid article { min-height: 245px; padding: 28px 25px; border-right: 1px solid var(--rule-strong); }
.interview-grid article:first-child { padding-left: 0; }
.interview-grid article:last-child { padding-right: 0; border-right: 0; }
.interview-grid h3 { margin: 36px 0 12px; font-family: var(--font-display); font-size: 24px; }
.interview-grid p { margin: 0; color: var(--ink-mute); font-size: 14px; }

.qualification-intro { align-items: start; }
.qualification-intro > div:last-child { max-width: 520px; }
.qualification-intro > div:last-child > p:first-child { margin-top: 0; color: var(--ink); font-weight: 750; }
.qualification-disclaimer { color: var(--ink-mute); font-size: 13px; }

.qualification-dashboard {
  display: grid;
  margin: 0 0 82px;
  padding: 34px 38px;
  border: 1px solid var(--ink);
  box-shadow: 12px 12px 0 var(--blue-soft);
  grid-template-columns: 230px 1fr auto;
  align-items: center;
  gap: 46px;
}

.qualification-dashboard strong { display: block; margin: 10px 0 13px; font-family: var(--font-display); font-size: 52px; line-height: 1; }
.qualification-dashboard h2 { margin: 0 0 8px; font-family: var(--font-display); font-size: 31px; }
.qualification-dashboard p { margin: 0; color: var(--ink-mute); }
.qualification-dashboard .button-text { margin: 0; }

.qualification-gates { border-top: 1px solid var(--ink); }
.qualification-gate {
  display: grid;
  padding: 34px 0;
  border-bottom: 1px solid var(--rule-strong);
  grid-template-columns: 92px 1fr;
  gap: 34px;
}

.qualification-check { display: flex; flex-direction: column; align-items: flex-start; gap: 13px; cursor: pointer; }
.qualification-check input { width: 22px; height: 22px; accent-color: var(--accent); }
.qualification-check span { color: var(--accent); font-family: var(--font-display); font-size: 34px; }
.qualification-gate-head { display: flex; justify-content: space-between; align-items: start; gap: 28px; }
.qualification-gate-head h2 { margin: 7px 0 22px; font-family: var(--font-display); font-size: 34px; }
.qualification-gate-head > a { flex: none; padding-top: 4px; color: var(--accent); font-size: 12px; font-weight: 750; }
.qualification-gate dl { display: grid; margin: 0; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.qualification-gate dl div { padding: 18px; background: var(--paper-2); }
.qualification-gate dt { margin-bottom: 10px; color: var(--ink-soft); font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.1em; text-transform: uppercase; }
.qualification-gate dd { margin: 0; color: var(--ink-mid); font-size: 13px; line-height: 1.65; }
.qualification-gate dl .qualification-fail { border-left: 2px solid var(--red); background: var(--red-soft); }
.qualification-gate dl .qualification-fail dt { color: var(--red); }

.qualification-lab {
  display: grid;
  margin: 95px 0 72px;
  padding: 42px;
  color: #fff;
  background: var(--ink);
  grid-template-columns: minmax(0, 1.4fr) minmax(290px, .6fr);
  align-items: end;
  gap: 50px;
}

.qualification-lab .eyeline { color: #9db6ff; }
.qualification-lab h2 { margin: 8px 0 16px; font-family: var(--font-display); font-size: 37px; }
.qualification-lab p { margin: 0; color: #aeb8c5; }
.qualification-lab-links { display: flex; flex-direction: column; align-items: stretch; gap: 12px; }
.qualification-lab-links .button-primary, .qualification-lab-links .button-secondary { justify-content: center; }
.qualification-lab-links .button-secondary { border-color: rgba(255,255,255,.5); color: #fff; }

.qualification-kit-section { padding: 12px 0 88px; }
.qualification-kit-grid { display: grid; margin-top: 42px; border-top: 1px solid var(--ink); grid-template-columns: repeat(3, 1fr); }
.qualification-kit-grid a { display: flex; min-height: 170px; padding: 24px; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); flex-direction: column; color: var(--ink); transition: background 160ms ease; }
.qualification-kit-grid a:nth-child(3n + 1) { padding-left: 0; }
.qualification-kit-grid a:nth-child(3n) { padding-right: 0; border-right: 0; }
.qualification-kit-grid a:hover { background: var(--blue-soft); }
.qualification-kit-grid span { color: var(--accent); font-family: var(--font-mono); font-size: 9px; letter-spacing: .1em; }
.qualification-kit-grid strong { margin: 33px 0 9px; font-family: var(--font-display); font-size: 24px; }
.qualification-kit-grid small { color: var(--ink-mute); font-size: 12px; line-height: 1.55; }

@media (max-width: 1180px) {
  .brand-note { display: none; }
  .principle-grid { grid-template-columns: repeat(2, 1fr); }
  .principle-grid article:nth-child(3n) { border-right: 1px solid var(--rule-strong); }
  .principle-grid article:nth-child(2n) { border-right: 0; }
  .principle-grid article:not(:nth-last-child(-n + 2)) { border-bottom: 1px solid var(--rule-strong); }
  .gate-grid { grid-template-columns: repeat(3, 1fr); }
  .gate-grid article:nth-child(3n) { border-right: 0; }
  .gate-grid article:nth-child(-n + 3) { border-bottom: 1px solid var(--rule); }
  .role-band { grid-template-columns: 1fr 1.3fr; }
  .role-band > .button-secondary { grid-column: 1 / -1; width: max-content; }
  .diagnostic-layout { grid-template-columns: minmax(0, 1fr) 330px; gap: 38px; }
}

@media (max-width: 960px) {
  .agent-hero { min-height: 0; }
  .agent-trace { margin: 0 auto; }
  .diagnostic-layout { grid-template-columns: 1fr; }
  .diagnostic-result { position: static; grid-row: 1; }
  .packet-grid { grid-template-columns: repeat(2, 1fr); }
  .packet-grid article:nth-child(3n + 1) { padding-left: 24px; }
  .packet-grid article:nth-child(3n) { padding-right: 24px; border-right: 1px solid var(--rule); }
  .packet-grid article:nth-child(odd) { padding-left: 0; }
  .packet-grid article:nth-child(even) { padding-right: 0; border-right: 0; }
  .interview-grid { grid-template-columns: 1fr; }
  .interview-grid article, .interview-grid article:first-child, .interview-grid article:last-child { min-height: 0; padding: 26px 0; border-right: 0; border-bottom: 1px solid var(--rule); }
}

@media (max-width: 720px) {
  .agent-trace { box-shadow: 7px 7px 0 var(--blue-soft); }
  .trace-step code { font-size: 9px; }
  .principles-section { padding-top: 72px; }
  .principle-grid { grid-template-columns: 1fr; }
  .principle-grid article, .principle-grid article:first-child, .principle-grid article:last-child { min-height: 0; padding: 24px 0; border-right: 0; border-bottom: 1px solid var(--rule); }
  .principle-grid h3 { margin-top: 26px; }
  .role-band { margin: 72px 0; grid-template-columns: 1fr; }
  .role-band > .button-secondary { grid-column: auto; width: 100%; }
  .diagnostic-layout { padding-bottom: 60px; }
  .diagnostic-item { padding-right: 0; padding-left: 0; grid-template-columns: 23px 35px 1fr; }
  .diagnostic-result { padding: 25px; box-shadow: 7px 7px 0 var(--blue-soft); }
  .diagnostic-result > strong { font-size: 49px; }
  .source-note { grid-template-columns: 1fr; gap: 8px; }
  .packet-grid { grid-template-columns: 1fr; }
  .packet-grid article, .packet-grid article:nth-child(3n + 1), .packet-grid article:nth-child(3n), .packet-grid article:nth-child(odd), .packet-grid article:nth-child(even) { min-height: 0; padding: 24px 0; border-right: 0; }
  .resume-lab { padding: 30px 24px; }
  .resume-lab h2 { font-size: 31px; }
  .danger-gate { padding: 28px 24px; }
}

/* Project Delivery China — project-room components */

.pm-hero {
  background:
    linear-gradient(90deg, transparent 0, transparent calc(50% - 1px), rgba(138, 47, 98, .055) 50%, transparent calc(50% + 1px)),
    var(--paper);
}

.pm-ledger .trace-step p {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
}

.pm-ledger .trace-step p strong {
  color: var(--ink);
  font-size: 11px;
  font-weight: 650;
}

.pm-ledger .trace-step p em {
  color: var(--ink-mute);
  font-size: 9px;
  font-style: normal;
  white-space: nowrap;
}

.pm-ledger .trace-step b::before {
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 7px;
  border-radius: 50%;
  content: "";
  background: var(--blue);
}

.pm-ledger .ledger-pass b::before { background: var(--green); box-shadow: 0 0 0 3px var(--green-soft); }
.pm-ledger .ledger-warn b::before { background: #c27913; }
.pm-ledger .ledger-blocked b::before { background: var(--red); box-shadow: 0 0 0 3px var(--red-soft); }
.pm-ledger .ledger-review b::before { background: var(--blue); }

.context-grid {
  display: grid;
  margin: 0 0 104px;
  border-top: 1px solid var(--ink);
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.context-card {
  min-height: 360px;
  padding: 28px 28px 32px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.context-card:nth-child(3n + 1) { padding-left: 0; }
.context-card:nth-child(3n) { padding-right: 0; border-right: 0; }
.context-card > span { color: var(--accent); font-family: var(--font-mono); font-size: 10px; letter-spacing: .13em; }
.context-card h2 { min-height: 68px; margin: 36px 0 14px; font-family: var(--font-display); font-size: 29px; font-weight: 520; line-height: 1.18; }
.context-card > p { min-height: 70px; margin: 0 0 26px; color: var(--ink-mid); font-size: 14px; }
.context-card dl { margin: 0; }
.context-card dl div { display: grid; padding: 13px 0; border-top: 1px dotted var(--rule-strong); grid-template-columns: 72px 1fr; gap: 12px; }
.context-card dt { color: var(--ink-soft); font-family: var(--font-mono); font-size: 9px; letter-spacing: .08em; }
.context-card dd { margin: 0; color: var(--ink-mid); font-size: 12px; line-height: 1.6; }

.scenario-lab {
  margin: 0 0 102px;
  padding: 46px 48px 50px;
  border: 1px solid var(--ink);
  box-shadow: 14px 14px 0 var(--accent-soft);
}

.scenario-lab .section-heading { margin-bottom: 38px; }
.scenario-lab .section-heading h2 { margin-top: 8px; font-size: clamp(38px, 4vw, 57px); }
.scenario-options { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.scenario-options button { min-height: 175px; padding: 24px; border: 0; border-right: 1px solid var(--rule-strong); background: var(--paper); text-align: left; cursor: pointer; transition: background 160ms ease, color 160ms ease; }
.scenario-options button:last-child { border-right: 0; }
.scenario-options button:hover { background: var(--blue-soft); }
.scenario-options button.is-selected { color: #fff; background: var(--ink); }
.scenario-options strong { display: block; margin-bottom: 25px; font-family: var(--font-display); font-size: 24px; font-weight: 520; }
.scenario-options span { display: block; color: var(--ink-mute); font-size: 13px; line-height: 1.65; }
.scenario-options button.is-selected span { color: #c8d0dc; }
.scenario-result { min-height: 195px; padding: 34px 0 0; }
.scenario-result h3 { margin: 9px 0 9px; font-family: var(--font-display); font-size: 30px; }
.scenario-result > p { max-width: 850px; margin: 0; color: var(--ink-mid); }
.scenario-impact { display: grid; margin-top: 28px; border-top: 1px solid var(--rule); grid-template-columns: repeat(5, 1fr); }
.scenario-impact span { padding: 15px 14px 0 0; color: var(--ink-mute); font-size: 12px; }
.scenario-impact b { display: block; margin-bottom: 4px; color: var(--accent); font-family: var(--font-mono); font-size: 9px; letter-spacing: .1em; }

.template-list article { position: relative; padding-bottom: 68px; }
.template-list article small { display: block; margin-top: 14px; color: var(--green); font-size: 11px; line-height: 1.55; }
.template-list article > a { position: absolute; bottom: 22px; left: 24px; display: inline-flex; align-items: center; gap: 8px; color: var(--accent); font-size: 12px; font-weight: 750; }
.template-list article:nth-of-type(3n + 1) > a { left: 0; }
.template-list article > a svg { width: 20px; }

.qualification-grid {
  display: grid;
  margin: 0 0 92px;
  border-top: 1px solid var(--ink);
  grid-template-columns: repeat(3, 1fr);
}

.qualification-grid .section-heading { grid-column: 1 / -1; margin: 0; padding: 58px 0 40px; }
.qualification-grid article { min-height: 285px; padding: 28px; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.qualification-grid article:nth-of-type(3n + 1) { padding-left: 0; }
.qualification-grid article:nth-of-type(3n) { padding-right: 0; border-right: 0; }
.qualification-grid article > span { color: var(--accent); font-family: var(--font-mono); font-size: 9px; letter-spacing: .12em; }
.qualification-grid h3 { margin: 40px 0 14px; font-family: var(--font-display); font-size: 26px; }
.qualification-grid p { margin: 0 0 20px; color: var(--ink-mid); font-size: 13px; }
.qualification-grid small { display: block; padding-top: 13px; border-top: 1px dotted var(--red); color: var(--red); font-size: 10px; line-height: 1.55; }

.reading-list .reading-item {
  grid-template-columns: minmax(0, 1.15fr) minmax(330px, .85fr);
  gap: 72px;
}

.reading-item > div:first-child > span { color: var(--accent); font-family: var(--font-mono); font-size: 9px; letter-spacing: .08em; }
.reading-item > div:last-child { padding-left: 28px; border-left: 1px solid var(--rule); }
.reading-item > div:last-child h3 { margin: 4px 0 10px; font-family: var(--font-display); font-size: 20px; }
.reading-item > div:last-child a { display: inline-flex; margin-top: 8px; align-items: center; gap: 8px; color: var(--accent); font-size: 12px; font-weight: 750; }
.reading-item > div:last-child svg { width: 20px; }

.glossary-list article {
  display: grid;
  padding: 26px 0 29px;
  border-bottom: 1px solid var(--rule-strong);
  grid-template-columns: minmax(190px, .5fr) minmax(220px, .55fr) minmax(0, 1.4fr) 90px;
  align-items: start;
  gap: 32px;
}

.glossary-list article[hidden] { display: none; }
.glossary-list article > span { color: var(--accent); font-family: var(--font-mono); font-size: 11px; letter-spacing: .06em; }
.glossary-list article h2 { margin: -5px 0 0; font-family: var(--font-display); font-size: 25px; font-weight: 520; }
.glossary-list article p { margin: 0; color: var(--ink-mid); font-size: 13px; line-height: 1.7; }
.glossary-list article small { color: var(--ink-mute); font-family: var(--font-mono); font-size: 9px; text-align: right; }

@media (max-width: 1180px) {
  .context-grid { grid-template-columns: repeat(2, 1fr); }
  .context-card:nth-child(3n + 1), .context-card:nth-child(3n) { padding-right: 28px; padding-left: 28px; border-right: 1px solid var(--rule); }
  .context-card:nth-child(2n + 1) { padding-left: 0; }
  .context-card:nth-child(2n) { padding-right: 0; border-right: 0; }
  .glossary-list article { grid-template-columns: 180px 200px minmax(0, 1fr); }
  .glossary-list article small { grid-column: 3; text-align: left; }
}

@media (max-width: 960px) {
  .scenario-options, .qualification-grid { grid-template-columns: 1fr; }
  .scenario-options button { min-height: 0; border-right: 0; border-bottom: 1px solid var(--rule); }
  .scenario-options button:last-child { border-bottom: 0; }
  .scenario-impact { grid-template-columns: repeat(2, 1fr); }
  .qualification-grid .section-heading { grid-column: auto; }
  .qualification-grid article, .qualification-grid article:nth-of-type(3n + 1), .qualification-grid article:nth-of-type(3n) { min-height: 0; padding: 26px 0; border-right: 0; }
  .reading-list .reading-item { grid-template-columns: 1fr; gap: 20px; }
  .reading-item > div:last-child { padding: 20px 0 0; border-top: 1px dotted var(--rule-strong); border-left: 0; }
}

/* 2026-07 desktop design and typography audit */
#site-header {
  position: sticky;
  z-index: 100;
  top: 0;
}

#site-header > .site-header {
  position: relative;
  top: auto;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

h1,
h2 {
  text-wrap: balance;
}

.lesson-main {
  font-size: 17px;
  line-height: 1.82;
}

.chapter-header h1 {
  font-size: clamp(42px, 3.8vw, 52px);
}

.lesson-section > h2 {
  font-size: 34px;
}

.lesson-section p,
.lesson-section li,
.lesson-section dd,
.lesson-section figcaption,
.reading-item p,
.callout-band p {
  text-wrap: pretty;
}

main [id] {
  scroll-margin-top: calc(var(--header-h) + 28px);
}

.lesson-section a,
.reading-item a,
.source-note a,
figcaption a,
.glossary-item a {
  overflow-wrap: anywhere;
}

pre,
.template-code,
.lab-code,
.formula {
  max-width: 100%;
  overflow-x: auto;
  tab-size: 2;
}

.brand-note,
.hero-facts span,
.trace-step span,
.trace-step b,
.principles > article > span,
.curriculum-section .stage-row small,
.reading-item dt,
.matrix-head span,
.diagnostic-item small,
.qualification-gate dt,
.qualification-kit-grid span {
  font-size: 10px;
}

.hero-facts strong,
.chapter-meta,
.score-value,
[data-global-progress] {
  font-variant-numeric: tabular-nums;
}

@media (min-width: 961px) and (max-width: 1360px) {
  .header-inner {
    width: min(var(--max), calc(100% - 40px));
    gap: 18px;
  }

  .brand-name { font-size: 20px; }
  .site-nav { gap: 14px; }
  .site-nav a { font-size: 12.5px; }

  .hero h1,
  .agent-hero h1 {
    font-size: clamp(48px, 4.5vw, 60px);
    line-height: 1.08;
  }
}

@media print {
  html { scroll-behavior: auto; }
  body { color: #000; background: #fff; font-size: 11pt; }
  .site-header,
  .site-footer,
  .lesson-toc,
  .lesson-aside,
  .chapter-navigation,
  .complete-button,
  .hero-actions,
  .menu-toggle { display: none !important; }
  .page-shell,
  .lesson-shell,
  .lesson-main { display: block !important; width: 100%; max-width: none; padding: 0; margin: 0; }
  .teaching-figure,
  .practice-card,
  .callout,
  .callout-band,
  table { break-inside: avoid; }
  a { color: #000; text-decoration: none; }
}